Arrangement in sail sheets



March 21, 1939. H. T. H. ANDRESEN ARRANGEMENT IN SAIL SHEETS Filed Aug. 28, 1957 Patented Mar. 21, 1939 v UNITED STATES PATENT OFFICE ARRANGEMENT IN SAIL SHEETS Halvor Tobias Heyerdahl Andresen,

, Oslo, Norway Application August 28, 1937, Serial No. 161,531 In Norway August 28, 1936 Claims. (Cl. 114-102) The present invention relates to arrangements sheet S is attached is so arranged that the bottom in sail sheets wherein the stretch from the sheet line I is carried over the pulley of a block a, to is transmitted to the sail by means of a plurality which the sail sheet S is connected, therefrom of lines tensioning the aft area of the sail at over the pulley in a block b and back to the center .1 different heights. of the block a. The lines 2 and 3 are intercon- 5 In arrangements of this kind it is of importnected and are running over the pulley of a ance for the correct setting of the sail that the block a, which is connected to the block b. In total force of the sheet is so distributed. on the order to strengthen the sail at the securing points lines that the stretching force transmitted by the of the lines one or more laths L may be sewed individual lines is in a favourable relation to up in the sail. m

the wind pressure acting on that portion of the In Fig. 2 a tackle system is shown wherein the sail which is held by the line in question; as force from the sheet S is distributed with one half well as to the setting required of the same poron the line I and one fourth on each of the lines tion of the sail, in order to give the entire sail a 2 and 3; Here the line I is run ing ver t p y '5 correct setting. In other words, the entire sail in the block a, which is connected to the sheet S, area may-be given a favourable aerodynamic form and is secured to the center of the block b, whereby a correct distribution of the force on the indiin the lines'2 and 3 are running over t e P vidual lines and of the points of attack of the In 'Fi 3 a tackle System Shown With the said lines on the sail. same distribution of forces on the lines as in the so In accordance with the present invention this system shown in Fig. 2. The block a, to which arrangement is obtained in that the individual the sheet S is connected here is a two-pulley lines, which are all tightened by means of the block and the line 3 is running over one Of the main sheet, are simultaneously tightened by being pulleys, over the pulley in the block In, to the carried over or through a system of rings or center of which block the line I is connected,

1 23 blocks, which system permits the individual lines back over the second pulley of th 10 0 W e 2 to adjust themselves freely according to the from the line is continued in the line 2. force transmitted by the individual lines. In Fig. 4 a tackle system is shown wherein the The number of lines used and the distribution distribution of the force on the lines is the folcf the force on the said lines are dependent on lowing: two fifths on line I, one fifth on line 2 is) the size and form of the sail. and two fifths on line 3. Here the line 2 is carried In the accompanying drawing some embodiover one pulley in the two-pulley block a, which ments of the invention are shown. is connected to the sheet S, over the pulley in the Fig. l is a schematic view in elevation of an block b3, to the center of which the line 3 is conarrangement in accordance with the invention; nected, back over the second pulley in the block Figures 2-5, '7 and 8 are diagrams of certain D1 to the center of which the line I is connected embodiments of the block systems are shown; and therefrom to the center of the block a. and In the system of four lines shown in Fig. 5, the Figure 6 arrangements 'as applied to a boat block a, which is connected to the sheet S, is a provided with a mainsail and a foresail are three-pulley block. The line I is running over 40 shown in side elevation. one of these pulleys, over the block be, to the cen- 40 In all the fi ures, S desi nates the m sheet, tel of which the the 2 is connected, over the P the total force. transmitted to the sail and pulley in the m 1, t t center of which t 3 the lines connected the In line 3 is connected, and is therefrom continued the embodiments-shown 1n the Figures 1-4, and as line 6-8 three Such lines are used and in 5 four In all the embodiments above described the lines are used, but two lines or a number of lines main Sheet S is connected to the center of the greater than four may be used block a, but obviously it is possible to carry the In the embodiment shown in Fig. 1 the atmain sheet through the blocks of the system. tacking points of the lines are located in the aft Embodiments of this kind are Shown in the 0 5O edge or leech of the sail, so distributed that each l of the lines conveniently is taking up equal forces 3 In Flgure 1 \sall'boat provlde'ji with mainsail and foresail 15 shown, each sail 5 being tightened by means of three lines I, 2 and 3 3. The tackle systems used are shown in a larger Accordingly the block system to which the main scale in the Figures 7 and 8, wherein the Figure 7 55 is illustrating the tackle system of the mainsail and Figure 8 the tackle system of the foresail.

In Fig. 7 the main block a is secured to the beam B extending from the deck of the boat, the tackle system being thereby maintained in position by the said beam B. The distribution of the force on the lines in this arrangement is one third on line I, one third on line 2 and one sixth on line 3, the main sheet S thus transmitting only one sixth of the total force transmitted.

In the arrangement shown in Fig. 8 the block a is free, thereby enabling the free movement of the foresail from one side of the boat to the other,

the total force being in this case transmitted by the main sheet S from the deck to the main block a. The force distribution in this arrangement is the following: two fifths on line I, two fifths on line 2 and one-fifth on line 3, the main sheet in this case transmitting the total force transmitted.

In both the last described arrangements the main sheet Sis running over a pulley in the block a, over the pulley of the block In, to the center of which the line I is secured, back over a pulley in the block a, over a pulley in the block bz, to the center of which the line 2 is secured, back over a pulley in the main block a and is continued in the line '3.

Other arrangements in the tackle system or other distributions of the lines than in the examples shown in the figures may be used, according to conditions.

' It. is obvious from the above description that the tackle system in itself may be made com paratively small as the relative movements of each line are small. Each of the stretching lines proper is connected to a separate point or is carried overa separate block in the tackle system. Of course, the terms block, blocks, and pulleys are used in an exemplary and broad sense in the present specification and claims and are intended to cover all permissible substitutions and may adopt a setting corresponding to the force transmitted by the same, and the sail may assume the most favorable aerodynamic form under the wind conditions prevailing.

.2. In the running rigging of sailing craft, a

. sheet arrangement in connection with a foreand-aft sail, comprising a sheet, a plurality of points of attachment distributed along the greater portion of the height of the leechof the sail,

means for distributing the force transmitted through the sheetamong said points of attachment invarious proportions, said means compristhe most favorable aerodynamic form ing a system of blocks and lines connecting said 7 points with saidsheet, said lines being freely movable relatively to each other through said syssame, and the sail may assume the most favorable aerodynamic form under the wind conditions prevailing. V I

3. In the running rigging of sailing craft, a sheet arrangement in connection with a foreand-aft sail, comprising a sheet, a plurality of points of attachment distributed along the greater portion of the height of the leech of the sail, means for distributing the force transmitted through'the sheet among said points of attachment in various proportions, said means comprising a system of blocks and lines connecting said points with said sheet, certain of said linesbeing secured to certain of said blocks and other of said lines being reeved through said blocks, said lines beingfreely movable relatively to' each other through said system, whereby they will at all times adopt a setting corresponding to the force transmitted-by the same, and the sail may assume under the wind conditions prevailing.

4. In the running rigging of sailing craft, a

' points of attachment distributed along the greater'portion of the height of the leechrof 'the sail, means for distributing the force transmitted through the sheet among said points of attachment in various proportions, said means comprising a main block to which an end of. said sheet is secured, a plurality of lines connected .to said points and reeved through and connected to said main blockand the other blocks of said system,

whereby each line may adopt the appropriate set ting to the force transmitted thereby at any given time and the sail may assume the most favorable aerodynamic 'form underthe Wind conditions 7 and-aft sail, comprising a sheet, a plurality of points of attachment distributed along the greater'portion of the height of the" leech of the sail,

means for, distributing the force transmitted through the sheet among said points of attachment in various proportions, said means compris-' ing a system of blocks and lines connecting said points with said sheet, certain of said lines being secured to certain of said blocks and other of said lines being reeved through said blocks, the sheet itself being reeved through the blocks of said system and attached to one point on the sail,'said lines being freely movable relatively to eachother through said system, whereby they will at all HALvoR To rAs HEYERDAHL ANDRESEN. 

